<script lang="tsx">
import type { CSSProperties } from "vue";
import type {
  FieldNames,
  TreeState,
  TreeItem,
  KeyType,
  CheckKeys,
  TreeActionType
} from "./types/Tree";

import {
  defineComponent,
  reactive,
  computed,
  unref,
  ref,
  watchEffect,
  toRaw,
  watch,
  onMounted
} from "vue";
import TreeHeader from "./components/TreeHeader.vue";
import { Tree, Spin, Empty } from "ant-design-vue";
import { TreeIcon } from "./TreeIcon";
import { ScrollContainer } from "/@/components/general/Container";
import { omit, get, difference, cloneDeep } from "lodash-es";
import { isArray, isBoolean, isEmpty, isFunction } from "/@/utils/Is";
import { extendSlots, getSlot } from "/@/utils/helper/TsxHelper";
import { filter, treeToList, eachTree } from "/@/utils/helper/TreeHelper";
import { useTree } from "./hooks/UseTree";
import { useContextMenu } from "/@/hooks/web/UseContextMenu";
import { CreateContextOptions } from "/@/components/general/ContextMenu";
import { treeEmits, treeProps } from "./types/Tree";
import { createBEM } from "/@/utils/Bem";

export default defineComponent({
  name: "BasicTree",
  inheritAttrs: false,
  props: treeProps,
  emits: treeEmits,
  setup(props, { attrs, slots, emit, expose }) {
    const [bem] = createBEM("tree");

    const state = reactive<TreeState>({
      checkStrictly: props.checkStrictly,
      expandedKeys: props.expandedKeys || [],
      selectedKeys: props.selectedKeys || [],
      checkedKeys: props.checkedKeys || []
    });

    const searchState = reactive({
      startSearch: false,
      searchText: "",
      searchData: [] as TreeItem[]
    });

    const treeDataRef = ref<TreeItem[]>([]);

    const [createContextMenu] = useContextMenu();

    const getFieldNames = computed((): Required<FieldNames> => {
      const { fieldNames } = props;
      return {
        children: "children",
        title: "title",
        key: "key",
        ...fieldNames
      };
    });

    const getBindValues = computed(() => {
      let propsData = {
        blockNode: true,
        ...attrs,
        ...props,
        expandedKeys: state.expandedKeys,
        selectedKeys: state.selectedKeys,
        checkedKeys: state.checkedKeys,
        checkStrictly: state.checkStrictly,
        fieldNames: unref(getFieldNames),
        "onUpdate:expandedKeys": (v: KeyType[]) => {
          state.expandedKeys = v;
          emit("update:expandedKeys", v);
        },
        "onUpdate:selectedKeys": (v: KeyType[]) => {
          state.selectedKeys = v;
          emit("update:selectedKeys", v);
        },
        onCheck: (v: CheckKeys, e) => {
          let currentValue = toRaw(state.checkedKeys) as KeyType[];
          if (isArray(currentValue) && searchState.startSearch) {
            const value = e.node.eventKey;
            currentValue = difference(currentValue, getChildrenKeys(value));
            if (e.checked) {
              currentValue.push(value);
            }
            state.checkedKeys = currentValue;
          } else {
            state.checkedKeys = v;
          }

          const rawVal = toRaw(state.checkedKeys);
          emit("update:value", rawVal);
          emit("check", rawVal, e);
        },
        onRightClick: handleRightClick
      };
      return omit(propsData, "treeData", "class");
    });

    const getTreeData = computed((): TreeItem[] =>
      searchState.startSearch ? searchState.searchData : unref(treeDataRef)
    );

    const getNotFound = computed((): boolean => {
      return !getTreeData.value || getTreeData.value.length === 0;
    });

    const {
      deleteNodeByKey,
      insertNodeByKey,
      insertNodesByKey,
      filterByLevel,
      updateNodeByKey,
      getAllKeys,
      getChildrenKeys,
      getEnabledKeys,
      getSelectedNode
    } = useTree(treeDataRef, getFieldNames);

    function getIcon(params: Recordable, icon?: string) {
      if (!icon) {
        if (props.renderIcon && isFunction(props.renderIcon)) {
          return props.renderIcon(params);
        }
      }
      return icon;
    }

    async function handleRightClick({ event, node }: Recordable) {
      const { rightMenuList: menuList = [], beforeRightClick } = props;
      let contextMenuOptions: CreateContextOptions = { event, items: [] };

      if (beforeRightClick && isFunction(beforeRightClick)) {
        let result = await beforeRightClick(node, event);
        if (Array.isArray(result)) {
          contextMenuOptions.items = result;
        } else {
          Object.assign(contextMenuOptions, result);
        }
      } else {
        contextMenuOptions.items = menuList;
      }
      if (!contextMenuOptions.items?.length) return;
      contextMenuOptions.items = contextMenuOptions.items.filter((item) => !item.hidden);
      createContextMenu(contextMenuOptions);
    }

    function setExpandedKeys(keys: KeyType[]) {
      state.expandedKeys = keys;
    }

    function getExpandedKeys() {
      return state.expandedKeys;
    }

    function setSelectedKeys(keys: KeyType[]) {
      state.selectedKeys = keys;
    }

    function getSelectedKeys() {
      return state.selectedKeys;
    }

    function setCheckedKeys(keys: CheckKeys) {
      state.checkedKeys = keys;
    }

    function getCheckedKeys() {
      return state.checkedKeys;
    }

    function checkAll(checkAll: boolean) {
      state.checkedKeys = checkAll ? getEnabledKeys() : ([] as KeyType[]);
    }

    function expandAll(expandAll: boolean) {
      state.expandedKeys = expandAll ? getAllKeys() : ([] as KeyType[]);
    }

    function onStrictlyChange(strictly: boolean) {
      state.checkStrictly = strictly;
    }

    watch(
      () => props.searchValue,
      (val) => {
        if (val !== searchState.searchText) {
          searchState.searchText = val;
        }
      },
      {
        immediate: true
      }
    );

    watch(
      () => props.treeData,
      (val) => {
        if (val) {
          handleSearch(searchState.searchText);
        }
      }
    );

    function handleSearch(searchValue: string) {
      if (searchValue !== searchState.searchText) searchState.searchText = searchValue;
      if (!searchValue) {
        emit("update:searchValue", searchValue, unref(treeDataRef));
        searchState.startSearch = false;
        return;
      }
      const { filterFn, checkable, expandOnSearch, checkOnSearch, selectedOnSearch } =
        unref(props);
      searchState.startSearch = true;
      const { title: titleField, key: keyField } = unref(getFieldNames);

      const matchedKeys: string[] = [];
      searchState.searchData = filter(
        unref(treeDataRef),
        (node) => {
          const result = filterFn
            ? filterFn(searchValue, node, unref(getFieldNames))
            : node[titleField]?.includes(searchValue) ?? false;
          if (result) {
            matchedKeys.push(node[keyField]);
          }
          return result;
        },
        unref(getFieldNames)
      );
      emit("update:searchValue", searchValue, searchState.searchData);
      if (expandOnSearch) {
        const expandKeys = treeToList(searchState.searchData).map((val) => {
          return val[keyField];
        });
        if (expandKeys && expandKeys.length) {
          setExpandedKeys(expandKeys);
        }
      }

      if (checkOnSearch && checkable && matchedKeys.length) {
        setCheckedKeys(matchedKeys);
      }

      if (selectedOnSearch && matchedKeys.length) {
        setSelectedKeys(matchedKeys);
      }
    }

    function handleClickNode(key: string, children: TreeItem[]) {
      if (!props.clickRowToExpand || !children || children.length === 0) return;
      if (!state.expandedKeys.includes(key)) {
        setExpandedKeys([...state.expandedKeys, key]);
      } else {
        const keys = [...state.expandedKeys];
        const index = keys.findIndex((item) => item === key);
        if (index !== -1) {
          keys.splice(index, 1);
        }
        setExpandedKeys(keys);
      }
    }

    watchEffect(() => {
      treeDataRef.value = props.treeData as TreeItem[];
    });

    onMounted(() => {
      const level = parseInt(props.defaultExpandLevel);
      if (level > 0) {
        state.expandedKeys = filterByLevel(level);
      } else if (props.defaultExpandAll) {
        expandAll(true);
      }
    });

    watchEffect(() => {
      state.expandedKeys = props.expandedKeys;
    });

    watchEffect(() => {
      state.selectedKeys = props.selectedKeys;
    });

    watchEffect(() => {
      state.checkedKeys = props.checkedKeys;
    });

    watch(
      () => props.value,
      () => {
        state.checkedKeys = toRaw(props.value || []);
      },
      { immediate: true }
    );

    watch(
      () => state.checkedKeys,
      () => {
        const v = toRaw(state.checkedKeys);
        emit("update:value", v);
        emit("change", v);
      }
    );

    watchEffect(() => {
      state.checkStrictly = props.checkStrictly;
    });

    const instance: TreeActionType = {
      setExpandedKeys,
      getExpandedKeys,
      setSelectedKeys,
      getSelectedKeys,
      setCheckedKeys,
      getCheckedKeys,
      insertNodeByKey,
      insertNodesByKey,
      deleteNodeByKey,
      updateNodeByKey,
      getSelectedNode,
      checkAll,
      expandAll,
      filterByLevel: (level: number) => {
        state.expandedKeys = filterByLevel(level);
      },
      setSearchValue: (value: string) => {
        handleSearch(value);
      },
      getSearchValue: () => {
        return searchState.searchText;
      }
    };

    function renderAction(node: TreeItem) {
      const { actionList } = props;
      if (!actionList || actionList.length === 0) return;
      return actionList.map((item, index) => {
        let nodeShow = true;
        if (isFunction(item.show)) {
          nodeShow = item.show?.(node);
        } else if (isBoolean(item.show)) {
          nodeShow = item.show;
        }

        if (!nodeShow) return null;

        return (
          <span key={index} class={bem("action")}>
              {item.render(node)}
            </span>
        );
      });
    }

    const treeData = computed(() => {
      const data = cloneDeep(getTreeData.value);
      eachTree(data, (item, _parent) => {
        const searchText = searchState.searchText;
        const { highlight } = unref(props);
        const {
          title: titleField,
          key: keyField,
          children: childrenField
        } = unref(getFieldNames);

        const icon = getIcon(item, item.icon);
        let colorIcon;
        if (item.iconColor) {
          colorIcon = { icon: icon, color: item.iconColor };
        } else {
          colorIcon = { icon: icon };
        }
        const title = get(item, titleField);
        const searchIdx = searchText ? title.indexOf(searchText) : -1;
        const isHighlight =
          searchState.startSearch && !isEmpty(searchText) && highlight && searchIdx !== -1;
        const highlightStyle = `color: ${isBoolean(highlight) ? "#f50" : highlight}`;

        const titleDom = isHighlight ? (
          <span class={unref(getBindValues)?.blockNode ? `${bem("content")}` : ""}>
              <span>{title.substr(0, searchIdx)}</span>
              <span style={highlightStyle}>{searchText}</span>
              <span>{title.substr(searchIdx + (searchText as string).length)}</span>
            </span>
        ) : (
          title
        );
        item[titleField] = (
          <span
            class={`${bem("title")} pl-2`}
            onClick={handleClickNode.bind(null, item[keyField], item[childrenField])}
          >
              {slots?.title ? (getSlot(slots, "title", item)) : (
                <>
                  {icon && <TreeIcon props={colorIcon} />}
                  {titleDom}
                  <span class={bem("actions")}>{renderAction(item)}</span>
                </>
              )}
            </span>
        );
        return item;
      });
      return data;
    });

    expose(instance);

    return () => {
      const { title, helpMessage, toolbar, search, checkable } = props;
      const showTitle = title || toolbar || search || slots.headerTitle;
      const scrollStyle: CSSProperties = { height: "calc(100% - 38px)" };
      return (
        <div class={[bem(), "h-full", attrs.class]}>
          {showTitle && (
            <TreeHeader
              checkable={checkable}
              checkAll={checkAll}
              expandAll={expandAll}
              title={title}
              search={search}
              toolbar={toolbar}
              helpMessage={helpMessage}
              onStrictlyChange={onStrictlyChange}
              onSearch={handleSearch}
              searchText={searchState.searchText}
            >
              {extendSlots(slots)}
            </TreeHeader>
          )}
          <Spin
            wrapperClassName={unref(props.treeWrapperClassName)}
            spinning={unref(props.loading)}
            tip="加载中..."
          >
            <ScrollContainer style={scrollStyle} v-show={!unref(getNotFound)}>
              <Tree {...unref(getBindValues)} showIcon={false} treeData={treeData.value} />
            </ScrollContainer>
            <Empty
              v-show={unref(getNotFound)}
              image={Empty.PRESENTED_IMAGE_SIMPLE}
              class="!mt-4"
            />
          </Spin>
        </div>
      );
    };
  }
});
</script>
